Happymodel CrazyF411 ELRS AIO 4in1 Flight controller built-in UART 2.4G ELRS and 20A ESC for Toothpick
*”ET” and “ER” pads are used for communication with ESP8285, you can connect “TX” of FTDI tool to “ET” pad and connect “RX” of FTDI tool to “ER” pad for upgrade onboard UART ELRS receiver firmware. Need to short connect “+5V” and “E5” pads before that. The CrazyF411 ELRS flight controller comes with integrated UART…